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I just put on one of the new filters and it was significantly smaller in diameter. I specifically asked the parts guy if they were for an S2000 and he said they were. I checked to make sure the rubber seals had similar diameter (they did) and it seemed to drive home fine, but I'm curious if I got the right filter since the pic above does not indicate a change in diameter for the S2000 filter.
If the Honda dealer sells you a filter that is dramatically smaller in diameter, they sold you the wrong filter, regardless of what they say, and I would not use it!
My pic is very clear, the old and the new are the same size. OLD on left & NEW on right